Anki problem

I've been using Anki decks containing Chinese sentences with sounds for several years now. They all used to work perfectly at one time on an older computer, now one of the decks will not play the sounds. Even on an Android phone it won't work, just that one deck, the others are fine. I've tried the obvious fixes like reinstalling and switching the location(s) of the media folder etc, nothing works. Is there some simple fix I'm missing, any reason why one deck should not play sounds that might be easily fixable?